is a one-dimensional GeoGraphics primitive that represents the separation line between the halves of the Earth currently in daytime and nighttime.
DayNightTerminator[datespec]
represents the separation line between day and night for the specified date.


DayNightTerminator
is a one-dimensional GeoGraphics primitive that represents the separation line between the halves of the Earth currently in daytime and nighttime.
DayNightTerminator[datespec]
represents the separation line between day and night for the specified date.
Details

- datespec can be specified as a DateObject or a string that resolves to a date.
- A date without explicit time zone is assumed to use $TimeZone.
Examples
open all close allBasic Examples (2)
Scope (3)
DayNightTerminator[] gives a plot for the current date and time:
Using Now explicitly gives the same result:
Tech Notes
Related Guides
History
Text
Wolfram Research (2014), DayNightTerminator, Wolfram Language function, https://reference.wolfram.com/language/ref/DayNightTerminator.html.
CMS
Wolfram Language. 2014. "DayNightTerminator." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/DayNightTerminator.html.
APA
Wolfram Language. (2014). DayNightTerminator. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DayNightTerminator.html
BibTeX
@misc{reference.wolfram_2025_daynightterminator, author="Wolfram Research", title="{DayNightTerminator}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/DayNightTerminator.html}", note=[Accessed: 13-August-2025]}
BibLaTeX
@online{reference.wolfram_2025_daynightterminator, organization={Wolfram Research}, title={DayNightTerminator}, year={2014}, url={https://reference.wolfram.com/language/ref/DayNightTerminator.html}, note=[Accessed: 13-August-2025]}